The LL1570 is designed for splitting signals in application where large ground differences may appear, but is also very

useful as a general purpose audio transformer. By careful design, the capacative coupling between the different part of

the transformer is kept to a minimum. The three-section winding structure which is necessary for decoupling also results

in a very high bandwidth. The transformer is built up from two coils, each with primary and secondary windings

separated by electrostatic shields, and a high permeability mu-metal core. The two coil structure in combination with the

mu-metal can results in high immunity to external magnetic fields.

In the LL1570XL, the core is about 45% larger than in the LL1570, resulting in a larger level capability.

Turns ratio: 1 + 1 : 1 + 1

Dimensions (Max. L x W x H above PCB(mm)) 38 x 24 x 20.5

Weight: 65 g

Static resistance of each primary: 62 Ω

Static resistance of each secondary: 62 Ω

Distortion (primary level, primaries connected 0.1% @ + 9 dBU, 50 Hz

in series, source impedance 800Ω ) 1 % < @ +19 dBU, 50 Hz

Self resonance point : > > 250 kHz

Optimum load for best square-wave response

(secondaries. in series):  2.8 kΩ in series with 0.7 nF

Frequency response (source 600Ω, load as

above, serial-serial connections): 10 Hz -- 200 kHz +/- 0.5 dB

Isolation winding-winding / winding-shield /

shield-shield 4 kV / 2 kV / 2 kV